==== tests/cases/compiler/incrementOnTypeParameter.ts (2 errors) ====
    class C<T> {
        a: T;
        foo() {
            this.a++; 
            ~~~~~~
!!! An arithmetic operand must be of type 'any', 'number' or an enum type.
            for (var i: T, j = 0; j < 10; i++) { 
                                          ~
!!! An arithmetic operand must be of type 'any', 'number' or an enum type.
            }
        }
    }